Xenon

Koushik 26/06/2026 19:58:08 Updated 26/06/2026 19:58:08

Property	Value
Atomic Number	54
Element	Xenon
Symbol	Xe
Atomic Mass	131.293 u
Number of Neutrons	77 (most common isotope, Xenon-132)
Number of Protons	54
Number of Electrons	54
Period	5
Group	18
Phase	Gas
Radioactive	No
Natural	Yes
Metal	No
Nonmetal	Yes
Metalloid	No
Type	Noble Gas
Atomic Radius	108 pm
Electronegativity	2.60 (Pauling scale)
First Ionization Energy	12.130 eV
Density	0.005887 g/cm³
Melting Point	−111.75 °C
Boiling Point	−108.10 °C
Number of Isotopes	9 stable (Xe-124, Xe-126, Xe-128, Xe-129, Xe-130, Xe-131, Xe-132, Xe-134, Xe-136)
Discoverer	William Ramsay, Morris Travers
Year	1898
Specific Heat	0.158 J/g·K
Number of Shells	5
Number of Valence Electrons	8